I ran into this Little Big Rig in Louisiana owned by professional fisherman Matt Greenblatt. Diesel Pickup owners like to imitate their older brother big rigs. Examples include air springs, exhaust stacks, cab lights, and now sleeper cabs.
I'm working on getting some more information on the details of how it was put together. This would be handy because sleeping in a truck is done often by many of us but its never that comfortable because you can't lay flat.
You get into the sleeper cab via the back seat of the crew cab. They are connected with a seal.
One thing automobiles need is a second small engine for handling low wheel loads (stop and go traffic), idling, and A/C and heat needs. The engines we have in our vehicles were designed for submarines, airplanes, boats, and stationary equipment that don't go through transient loads. I plan on building a better system...one finally designed for automobiles and trucks.